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Wittichenite Semiconductor of Cu3BiS3 Films for Efficient Hydrogen Evolution from Solar Driven Photoelectrochemical Water Splitting


A highly efficient, low-cost and environmentally friendly photocathode with long-term stability is the goal of practical solar hydrogen evolution applications. Here, we found that the Cu3BiS3 film-based photocathode meets the abovementioned requirements. The Cu3BiS3-based photocathode presents a remarkable onset potential over 0.9 VRHE with excellent photoelectrochemical current densities (~7 mA/cm2 under 0 VRHE) and appreciable 10-hour long-term stability in neutral water solutions. This high onset potential of the Cu3BiS3-based photocathode directly results in a good unbiased operating photocurrent of ~1.6 mA/cm2 assisted by the BiVO4 photoanode. A tandem device of Cu3BiS3-BiVO4 with an unbiased solar-to-hydrogen conversion efficiency of 2.04% is presented. This tandem device also presents high stability over 20 hours. Ultimately, a 5 × 5 cm2 large Cu3BiS3-BiVO4 tandem device module is fabricated for standalone overall solar water splitting with a long-term stability of 60 hours.

Funding source: National Natural Science Foundation of China (No. 61704060); Scientific and Technological Plan of Guangdong Province (No. 2021A0505030061; No. 2019B090905005; No. 2020A1414010058); “Outstanding Young Talent Project” of South China Normal University, Characteristic Innovation Research Project of the University Teachers in Guangdong Province (No. 2020XCC07);Innovation Project of Graduate School of South China Normal University.
Related subjects: Production & Supply Chain

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